DieHard 200.71221 Owner's Manual - Page 9

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Calculating

charge

time

The Chart

Method

Use the following table to more accurately determine

the time it will take to bring a battery to full charge.

First, identify where your battery fits into the chart.

• Small batteries--

motorcycles, garden tractors,

etc. -- are usually rated in Ampere Hours (AH).

For example: 6 to 12 AH, or 12 to 32 AH.

• Batteries in cars and smaller trucks are usually

rated in Reserve Capacity (FIC), Cold-Cranking

Amps (CCA), or both.

• Marine or deep-cycle batteries are usually rated in

Reserve Capacity (RC).

• NR means that the charger setting is NOT REC-

OMMENDED.

Find your battery's rating on the chart below and note

the charge time given for each charger setting. The

times given are for batteries with a 50-percant charge

prior to recharging. Add more time for severely dis-

charged batteries.

SMALL

BA'I-FERIES

CAFIFFRUCKS

Motorcycle, garden

tractor, etc.

2OO - 315 CCA

315 - 55O CCA

550 - 1000 CCA

MARINE/DEEP CYCLE

6-12AH

12 - 32 AH

4O - 60 RC

60 - 85 RC

85 -190 RC

80 RC

140 RC

160 RC

180 RC

2-4

4-10

11 -14

14 -18

18 - 35

2 - 27/8

27/8.33/4

33/4- 7

31/2

51/2

The Hydrometer

or Electronic

Method

To find the time needed to fully charge your battery,

determine the battery's charge level with a hydrometer

or electronic Percent-of-Charge

Tester. The following

table will help you convert hydrometer readings to

percent of charge values.

1.265

100%

1.225

75%

25%

1.155

25%

75%

1.120

100%

When you know the percent of charge and the Amp

Hour (AH) rating of your battery, you can calculate the

approximate time needed to bdng your battery to a full

charge.

To convert Reserve Capacity to Amp Hours, divide

Reserve Capacity by 2, and add 16:

Amp Hours = _

+16

To calculate time needed for a charge:

• Find the percent of charge needed. (A battery at

50 percent charge that will be charged to 100

percent needs another 50 percent (.50).

• Multiply the Amp Hour rating by the charge needed

(.50) and divide by the charger setting

(2 or 10 amps).

• Multiply the result by 1.25 and you'll have the

approximate time needed, in hours, to bring the

battery to full charge.

• Add one additional hour for a deep-cycle battery.

Example:

AmD Hour Ratino x charoe needed x 1.25 :

hours

Charger Setting

of charge

100 fAH Ratlno_ x .50 (char oe needed_ x 1.25 :

6.25

10 (Charger Setting)

hours

100 x.50 : 5 x 1.25 : 6.25

You would need to charge your 100-Ampere Hour

Battery for approximately 6¼ hours at the 10-Amp

charge rate using the above example.